Arctic Tern, Matinicus Rock, Maine, July 31, 1949

Double-crested Cormorants, July 13, 1940

Double-crested Cormorants, July 13, 1940

Double-crested Cormorants, July 13, 1940

Cliff and Grassy Talus, Glen Canyon, Utah, September 1961

Mesilla, New Mexico, April 19, 1940

Black Place, New Mexico, September 1945

Bank, Tombstone, Arizona, April 20, 1940

Alexandria, Virginia, September 1940

Great Black-backed Gull, Nest, Maine, May 1-15, 1938

Meadowlark, Illinois, May 23, 1942

Alexandria, Virginia, September 1940

Kleine Storbach, Berwang, Austrian Tyrol, 1935

Fish Hawk, July 18, 1940

Fish Hawk, July 18, 1940

Spotted Sandpiper, June 28, 1940

Fish Hawk, July 9, 1940

Roadrunner, Arizona, May 2, 1941

Double-crested Cormorant, Two Families, Young in Nest, 1937

Alder Flycatcher, July 15, 1939